Find the Volume of the Described Solid $x$ -Axis At $x = 0$

Find the volume of the described solid.
-The solid lies between planes perpendicular to the $x$ -axis at $x = 0$ and $x = 9$ . The cross sections perpendicular to the $x$ -axis between these planes are squares whose bases run from the parabola $y = - 2 \sqrt { x }$ to the parabola $y = 2 \sqrt { x }$ .

A) 162
B) 648
C) 324
D) 640